Electromagnetically actuatable fuel injection valve

US4365747A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Heinrich Knapp · Leonberg, DE
• Rudolf Sauer · Memmingen, DE
• Waldemar Hans · Bamberg, DE
• Mathias Linssen · Scheßlitz, DE
• Jurgen Peczkowski · Gunzenhausen, DE
• Rudolf Krauss · Stuttgart, DE

Key dates

• Filing date: Jul 11, 1980
• Grant date: Dec 28, 1982
• Expiry date: Jul 11, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/53552
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection valve and a method for the automatic establishment of the desired armature stroke of the fuel injection valve are proposed which serves the purpose of injection at low fuel pressures into the intake tube of a mixture-compressing internal combustion engine with externally-supplied ignition. The fuel injection valve includes a magnetic coil surrounding a core and a flat armature guided by at least one guide diaphragm held on its outer circumference, which is firmly connected with a movable valve element cooperating with a fixed valve seat. The fuel delivered via a fuel inlet nozzle can proceed through apertures and recesses in the guide diaphragms past the valve seat to a fuel discharge nozzle by way of which a portion of the delivered fuel can flow back again into a fuel return line. Via an annular channel the fuel stream exiting from the nozzle bore can be prepared with air which surrounds the fuel stream.